Journal
SCIENCE
Volume 308, Issue 5718, Pages 118-120Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1106910
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Plants encode subunits for a fourth RNA polymerase (Pot IV) in addition to the well-known DNA-dependent RNA polymerases I, II, and III. By mutation of the two largest subunits (NRPD1a and NRPD2), we show that Pot IV silences certain transposons and repetitive DNA in a short interfering RNA pathway involving RNA-dependent RNA polymerase-2 and Dicer-like 3. The existence of this distinct silencing polymerase may explain the paradoxical involvement of an RNA silencing pathway in maintenance of transcriptional silencing.
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